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The operation of electromagnets is a practical example of converting electrical energy into magnetic energy.The kinetic energy of a moving object depends on the mass of the object and the speed at which it is moving.English physicist James Prescott Joule established that heat is a form of energy.One joule of work is done when a force of 1 newton displaces a body through a distance of 1 metre in the direction of the force.Sound energy can be used in remote sound-controlled systems to switch devices like lights, radios, fans, or televisions on or off.The law of conservation of energy states that energy can neither be created nor be destroyed, but can only be transformed from one form to another.Mechanical energy is the energy acquired by an object by virtue of its position or its state of motion.During photosynthesis, plants convert light energy from the sun into chemical energy.Work is calculated as the product of the force applied to a body and the displacement of the body in the direction of that force.As a weight falls from a height, its stored potential energy is progressively converted into kinetic energy due to its downward motion.At its highest leftmost or rightmost position, the pendulum bob has maximum potential energy and zero kinetic energy.When work is done on a body, the energy of that body increases.Nuclear energy is used to produce heat energy, which produces steam to turn the blades of turbines that generate electricity.A stretched rubber band possesses potential energy because work is done on it to change its shape against its natural resting state.The chemical energy in the food we eat is released during chemical changes in our body and is stored in our muscles as muscular energy.
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Chapter: 03. Energy
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